Twister stop-motion.



C. STANSFIELD. TTTTTTTTTTTTTTTT N.

Fig. 1.

CHARLES STANSFIELD, OF JAMESTOVII N, NEW "IQRK, ASSIGNOR' T0 DRAPER COMPANY, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

TWISTER STOP-MOTION.

Application filed October 7,

To all whom it may concern Be it known that 1, CHARLES STANSFIELD, a citizen of the United States, and resident of Jamestown, county of Chautauqua, State of New York, have invented an Improvement in Twister Stop-Motions, of which the following description, in connection with the'accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to twister stop mo-. tion of the type wherein a holder mounted pivotally on the axis of the top roll is supported by the running thread and is provided with a tongue which is permitted to feed in between the rolls and stop rotation of the top roll when the holder drops upon failure or undue slackness of the thread. A device of this type is illustrated in the patent to Stansfield No. 1,039,320, granted September 24, 1912. Certain faults have developed in the use of this type of stop motion because of the tongue withdrawing from between the rolls and allowing the. feeding of the thread to continue. The thread usually breaks near the traveler or ring while the lifter rail is near, the bottom of the traverse due to the increasing drag or tension at this time and therefore a long end is left. The sudden drag on the broken end often jerks the tongue out from between the rolls whereupon the rolls continue feeding and the broken end is entangled with other adjacent threads, is woundabout the bottom roll, or is otherwise misplaced. Sometimes the end catches upon athread running to an adjoining spindle and without being noticed runs onto that spindle, thus twisting a much heavier section of yarn upon the spindle with a consequent waste of material and bad product. These stop motions are not infrequently so badly adjusted or run at such irregular speed that the thread slackens sufliciently to allow the tongue to move between the rolls causing the feed to stop but without stopping delivery of the thread which is not broken. This results in giving an extra twist to the yarn and in time this extra twist and the tension on the yarn becomes strong enough to pull the tongue from between the rolls, allowing the feeding to take place in the regular way. This action may be kept up indefinitely and results in the twisting of a very Specification of Letters Patent.

1914 Serial No. 865,423.

uneven yarn. if These faults are all cured by the present invention which provides a means for automatically locking the holder,

when brought into stopping position, in

said position, and to secure this result is the object of the present invention. 7

-The nature and object of the invention will more fully appear from the accompanylng description and drawings and will be particularly pointed out in the claims.

In the drawings, Figurel is a view in side elevation and partial section of a twister stop motion embodying a preferred form of the, present invention showing the partsin running position and Fig. 2 is a view similar to Fig. 1 showing the parts in stopping position and locked therein.

The usual bottom roll 1 ofthe twister is positively driven" in the usual manner. The. top rolls 2 of which there are a series, have their axes 3 loosely mounted in bearings 4c in the bearing member 5 supported, on the cross-bar 6 so that the'top rolls rest upon,

and are rotated by contact with the bottom roll 1. The thread feeds over the front of the top roll 2, thence around and back over the bottom roll 1 as shown in Fig. 1.

The stop motion mechanism of the type in question comprises the holder 7 loosely pivoted or fulcrumed on the axis 3 of the top roll, the .wire leg 8; projecting from the holder and providedat itsfree end with the guide eye 9, through which the thread runs, and the tongue 10, usually of thin metal secured to and projecting downwardly from the holder. When the thread is feeding normally the wire leg 8 supports the holder in substantially horizontal position as shown in Fig. 1. If now, the thread breaks or fails or becomes abnormally slack, the holder will drop about its pivot allowing the tongue 10 be limited thereby and is to be determined 7 by the scope of the claims.

The bearing member 5 is provided rear-,

wardly of the top roll bearing with a recess 11 and for this purpose the usual recess into which the top rolls are lifted by the opera- Patented Feb. a, rare.

tive when cleaning or adjusting, may be employed. A latch 12 is pivoted at 13 to the holder and has a projecting end 14 normally resting behind the bearing member 5. A stop pin 15 is also provided in the holder. The latch, pin and recess are so arranged that when the holder falls into stopping position, the latch will swing by gravity to bring the projecting end it into the recess 11, thus making it impossible for the holder to rise out of stopping position until the latch is disengaged from the recess. The holder is thus automatically locked in stopping position. VVhen it is desired to release the thread or insert a new thread, the latch is swung by hand back against the stop pin 15 into the position shown in dotted lines in Fig. 2 when the holder can be raised and withdrawn from stopping position. Then when it is desired to resume twisting, the latch is dropped back into the position shown in Fig. 1.

Having fully described myinvention, what I claim as new and desire to obtain by Letters Patent, is:

1. In a twister provided with top and bottom rolls and bearing members for the top roll, a pivotally mounted holder provided with a tongue to enter between the top and bottom rolls and stop rotation of the former upon breakage, failure, or undue slackness of the thread, a recess in the top roll bearing member at the rear of the bearing, a latch pivotally mounted on said holder at the rear of the bearing and automatically swinging into engagement with said recess when the holder moves to stopping position, whereby the holder is automatically locked in said position.

2. In a twister provided with top and bot-- tom rolls and bearing members for the top roll, a pivotally mounted holder provided with a tongue to enter between the top and bottom rolls and stop rotation of the former upon breakage, failure, or undue slackness Copies ofthis patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

